from zvt.factors import GoldCrossFactor
from zvt.domain import Stock1dHfqKdata, Stock1dKdata
from zvt.domain import Stock

df = Stock1dKdata.query_data(entity_ids=["stock_sz_000001", "stock_sz_000003"], provider="em")
ts = list(set(df["timestamp"]))
ts.sort()
print(len(ts))